Cold case murder solved not by police -- by a young woman who was determined to find her father's killer she helped police -- their guy and she says. All it took was a background check website and 280 dollars the murder happened in the Bronx in 1986 the suspect taken into custody down in Florida. Eyewitness News reporter Sandra book -- -- with a woman about her lifelong mission. I think they'll and shocking -- -- don't. Believe that it happened. But -- Martinez does admit there's a certain amount of satisfaction in knowing that her father's alleged killer is finally behind bars. And she played a big role in putting -- there it's what I had to do for my father. I -- ago. Jocelyn was only nine years old back in 1986. When her father Jose was shot to death in front of the families -- -- street restaurant in inlet. We suspect then identified the shooter is sixteen year old who -- Santos but he was never caught and reportedly fled the country. But he couldn't run from -- the now 36 year old spent the last eight years searching Internet sites like background checks dot com and USA people searched before finally realizing she'd found her man. I click on my computer I realized. I had that person right there. Number one on a report. Jocelyn gave the information she'd been compiling two detectives at the 34 precinct had already reopened the case at her insistence. Last Thursday -- Santos was arrested in Miami and appeared in court today he'll be extradited back to New York to face murder charges. Even the NYPD gives the very determined daughter credit for cracking this case. Supply of water. -- suits. Now admirable. When she did Jocelyn believes -- to -- -- will allow her father and her family to finally rest in peace. We know it's not gonna bring the person back. -- this. -- my dad -- Buckman channel seven Eyewitness News.

This transcript has been automatically generated and may not be 100% accurate.

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